"When we first did the financing option, we didn't get it quite right," said Musk during a live webcast on the subject. We found Tesla's claimed savings were too exaggerated when we broke down the numbers last month, but Tesla says they'll make more sense now. To start, the company now guarantees a resale value of 50 percent after three years (ratings by ALG), up from the previous 43 percent. That figure will be adjusted in the future to keep it above its luxury sedan competition. "If we really believe we're making the best car, we believe it should have the best resale value," Musk said. That means Tesla's guarantee should assure the residual value will be higher than premium sedans from Mercedes-Benz BMW, Audi, Jaguar, and Lexus.In addition, the company has extended loans to 72 months instead of 63 months. The 12,000-mile annual limit has also been increased to 15,000 miles. Tesla's True Cost of Ownership Model S Calculator online is a bit more conservative now, as well.After the first financing option was announced, Tesla has seen more interest in the 60 kW-hr model, but most buyers still go with the 85 kW-hr car. "What we're saying is you'll get 20 percent more cash in three years," Musk said.With Tesla's ultimate goal of making the Model S more accessible to interested consumers, we're thinking the best way to accomplish that goal is to simply introduce a less expensive car.